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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f7556d6875a162dfdd93fede06f2c809b65ea6a1bfc1aab9cecc3f1b3b49d17' 
  AND token = 'RwJN/NMxtXQT0X12Ns6zcP2HfE23dC5Mwaf4zniN128=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}